Petedunnite
A valid IMA mineral species
This page kindly sponsored by Tony Nikischer
About Petedunnite
Pete Dunn
Formula:
CaZnSi2O6
Colour:
Dark green
Lustre:
Vitreous
Hardness:
5 - 6
Specific Gravity:
3.68 (Calculated)
Crystal System:
Monoclinic
Member of:
Name:
Named in 1987 by Eric J. Essene and Donald Ralph Peacor in honor of Pete J. Dunn [b. November 10, 1942 USA, d. November 8, 2017 USA], Museum Specialist, Department of Mineral Sciences, Smithsonian Institution, Washington, D.C., who studied and made major contributions to the mineralogy of the Franklin, New Jersey Mining District.
Unique Identifiers
Mindat ID:
3173
Long-form identifier:
mindat:1:1:3173:4
IMA Classification of Petedunnite
Approved
IMA Formula:
CaZn2+Si2O6
Approval year:
1983
Classification of Petedunnite
9.DA.15
9 : SILICATES (Germanates)
D : Inosilicates
A : Inosilicates with 2-periodic single chains, Si2O6; pyroxene family
9 : SILICATES (Germanates)
D : Inosilicates
A : Inosilicates with 2-periodic single chains, Si2O6; pyroxene family
65.1.3a.5
65 : INOSILICATES Single-Width,Unbranched Chains,(W=1)
1 : Single-Width Unbranched Chains, W=1 with chains P=2
65 : INOSILICATES Single-Width,Unbranched Chains,(W=1)
1 : Single-Width Unbranched Chains, W=1 with chains P=2
14.7.15
14 : Silicates not Containing Aluminum
7 : Silicates of Ba, Sr and Zn
14 : Silicates not Containing Aluminum
7 : Silicates of Ba, Sr and Zn
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference for Standard |
|---|---|---|
| Pdu | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Petedunnite
Vitreous
Transparency:
Translucent
Colour:
Dark green
Streak:
Greenish white
Hardness:
5 - 6 on Mohs scale
Cleavage:
Distinct/Good
{110}
{110}
Density:
3.68 g/cm3 (Calculated)
Optical Data of Petedunnite
Type:
Biaxial (+)
RI values:
nα = 1.68(1) nβ = 1.69(1) nγ = 1.70(1)
2V:
Measured: 70° to 90°, Calculated: 88°
Max. Birefringence:
δ = 0.020
Based on recorded range of RI values above.
Based on recorded range of RI values above.
Interference Colours:
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
Surface Relief:
Moderate
Dispersion:
r > v strong
Pleochroism:
Visible
Comments:
X = Y = light yellow; Z = light green.
Chemistry of Petedunnite
Mindat Formula:
CaZnSi2O6
Element Weights:
Elements listed:
Common Impurities:
Al,Fe,Na
Crystallography of Petedunnite
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/b
Setting:
C2/c
Cell Parameters:
a = 9.82(2) Å, b = 9.00(1) Å, c = 5.27(2) Å
β = 105.6(2)°
β = 105.6(2)°
Ratio:
a:b:c = 1.091 : 1 : 0.586
Unit Cell V:
448.61 ų (Calculated from Unit Cell)
Z:
4
Crystal Structure
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
| ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
|---|---|---|---|---|---|---|---|
| 0010331 | Petedunnite | Redhammer G J, Roth G (2005) A comparison of the clinopyroxene compounds CaZnSi2O6 and CaZnGe2O6 Acta Crystallographica C61 i20-i22 |  | 2005 | synthetic | 0 | 293 |
| 0009003 | Petedunnite | Heuer M, Huber A L, Bromiley G D, Fehr K T, Bente K (2005) Characterization of synthetic hedenbergite (CaFeSi2O6)-petedunnite (CaZnSi2O6) solid solution series by X-ray single crystal diffraction Physics and Chemistry of Minerals 32 552-563 | 2005 | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 3.02 Å | (100) |
| 2.537 Å | (80) |
| 2.96 Å | (40) |
| 2.589 Å | (30) |
| 2.022 Å | (30) |
| 6.49 Å | (10) |
| 2.227 Å | (10) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| High-? alteration and/or metamorphism | |
| 32 : Ba/Mn/Pb/Zn deposits, including metamorphic deposits |
Type Occurrence of Petedunnite
General Appearance of Type Material:
portions of an anhedral crystal consisting of a mosaic of 10-100 μm-sized subgrains containing abundant inclusions.
Place of Conservation of Type Material:
Department of Geological Sciences, University of Michigan, Ann Arbor, Michigan; National Museum of Natural History, Washington, D.C., USA (NMNH 162211).
Geological Setting of Type Material:
metamorphosed stratiform zinc deposit
Associated Minerals at Type Locality:
Synonyms of Petedunnite
Other Language Names for Petedunnite
Relationship of Petedunnite to other Species
Member of:
Other Members of Clinopyroxene Subgroup:
| Aegirine | NaFe3+Si2O6 | Mon. 2/m : B2/b |
| Aegirine-augite | (NaaCabFe2+cMgd)(Fe3+eAlfFe2+gMgh)Si2O6 | Mon. 2/m : B2/b |
| Augite | (CaxMgyFez)(Mgy1Fez1)Si2O6 | Mon. 2/m : B2/b |
| Burnettite | CaVAlSiO6 | Mon. 2/m : B2/b |
| Clinoenstatite | MgSiO3 | Mon. 2/m : P21/b |
| Clinoferrosilite | Fe2+2Si2O6 | Mon. 2/m : P21/b |
| Colomeraite | NaTi3+Si2O6 | Mon. 2/m : B2/b |
| Davisite | CaScAlSiO6 | Mon. 2/m : B2/b |
| Diopside | CaMgSi2O6 | Mon. 2/m : B2/b |
| Esseneite | CaFe3+[AlSiO6] | Mon. 2/m : B2/b |
| Grossmanite | CaTi3+ AlSiO6 | Mon. 2/m : B2/b |
| Hedenbergite | CaFe2+Si2O6 | Mon. 2/m : B2/b |
| Jadeite | Na(Al,Fe3+)Si2O6 | Mon. 2/m : B2/b |
| Jervisite | NaSc3+Si2O6 | Mon. 2/m : B2/b |
| Johannsenite | CaMn2+Si2O6 | Mon. 2/m : B2/b |
| Kanoite | Mn2+MgSi2O6 | Mon. 2/m : P21/b |
| Kosmochlor | NaCrSi2O6 | Mon. 2/m : B2/b |
| Kushiroite | CaAlAlSiO6 | Mon. 2/m : B2/b |
| Namansilite | NaMn3+Si2O6 | Mon. 2/m : B2/b |
| Natalyite | NaV3+Si2O6 | Mon. 2/m : B2/b |
| Omphacite | (NaaCabFe2+cMgd)(AleFe3+fFe2+gMgh)Si2O6 | Mon. 2/m |
| Pigeonite | (CaxMgyFez)(Mgy1Fez1)Si2O6 | Mon. 2/m : P21/b |
| Ryabchikovite | CuMgSi2O6 | Mon. 2/m : P21/b |
| Spodumene | LiAlSi2O6 | Mon. 2/m : B2/b |
| Tissintite | (Ca,◻)AlSi2O6 | Mon. 2/m : B2/b |
| 'UM2003-36-SiO:CaNa' | NaCrSi2O6 - CaMgSi2O6 | Mon. 2/m : B2/b |
Common Associates
Associations Based on Photo Data:
| 4 photos of Petedunnite associated with Willemite | Zn2SiO4 |
| 2 photos of Petedunnite associated with Hedenbergite | CaFe2+Si2O6 |
| 1 photo of Petedunnite associated with Albite | Na(AlSi3O8) |
| 1 photo of Petedunnite associated with Calcite | CaCO3 |
| 1 photo of Petedunnite associated with Fluorapatite | Ca5(PO4)3F |
| 1 photo of Petedunnite associated with Quartz | SiO2 |
Related Minerals - Strunz-mindat Grouping
| 9.DA. | Colomeraite | NaTi3+Si2O6 |
| 9.DA. | Protoenstatite | Mg2Si2O6 |
| 9.DA. | Ryabchikovite | CuMgSi2O6 |
| 9.DA.05 | Donpeacorite | Mn2+MgSi2O6 |
| 9.DA.05 | Enstatite | Mg2Si2O6 |
| 9.DA.05 | Ferrosilite | Fe2+2Si2O6 |
| 9.DA.10 | Clinoenstatite | MgSiO3 |
| 9.DA.10 | Clinoferrosilite | Fe2+2Si2O6 |
| 9.DA.10 | Kanoite | Mn2+MgSi2O6 |
| 9.DA.10 | Pigeonite | (CaxMgyFez)(Mgy1Fez1)Si2O6 |
| 9.DA.15 | Grossmanite | CaTi3+ AlSiO6 |
| 9.DA.15 | Diopside | CaMgSi2O6 |
| 9.DA.15 va | 'Jeffersonite' | Ca(Mn,Zn,Fe)Si2O6 |
| 9.DA.15 | Hedenbergite | CaFe2+Si2O6 |
| 9.DA.15 | Johannsenite | CaMn2+Si2O6 |
| 9.DA.15 | Esseneite | CaFe3+[AlSiO6] |
| 9.DA.15 | Kushiroite | CaAlAlSiO6 |
| 9.DA.15 | Augite | (CaxMgyFez)(Mgy1Fez1)Si2O6 |
| 9.DA.15 | Davisite | CaScAlSiO6 |
| 9.DA.20 | Aegirine-augite | (NaaCabFe2+cMgd)(Fe3+eAlfFe2+gMgh)Si2O6 |
| 9.DA.20 | Omphacite | (NaaCabFe2+cMgd)(AleFe3+fFe2+gMgh)Si2O6 |
| 9.DA.25 | Jadeite | Na(Al,Fe3+)Si2O6 |
| 9.DA.25 | Namansilite | NaMn3+Si2O6 |
| 9.DA.25 | Natalyite | NaV3+Si2O6 |
| 9.DA.25 | Aegirine | NaFe3+Si2O6 |
| 9.DA.25 | Jervisite | NaSc3+Si2O6 |
| 9.DA.25 | Tissintite | (Ca,◻)AlSi2O6 |
| 9.DA.25 | Kosmochlor | NaCrSi2O6 |
| 9.DA.30 | Spodumene | LiAlSi2O6 |
| 9.DA.35 | Hiroseite | FeSiO3 |
Other Information
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Petedunnite
mindat.org URL:
https://www.mindat.org/min-3173.html
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References for Petedunnite
Reference List:
Essene, Eric J., Peacor, Donald R. (1987) Petedunnite (CaZnSi2O6), a new zinc clinopyroxene from Franklin, New Jersey, and phase equilibria for zincian pyroxenes. American Mineralogist, 72 (1-2) 157-166
Huber, A. L.; Heuer, M.; Fehr, K. T.; Bente, K.; Schmidbauer, E.; Bromiley, G. D. (2004) Characterization of synthetic hedenbergite (CaFeSi2O6)-petedunnite (CaZnSi2O6) solid solution series by X-ray powder diffraction and 57Fe Mössbauer spectroscopy. Physics and Chemistry of Minerals, 31 (2). 67-79 doi:10.1007/s00269-003-0335-1
Localities for Petedunnite
Showing 11 localities.
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and further information on this occurrence.
? - Indicates mineral may be doubtful at this locality.
- Good crystals or important locality for species.
- World class for species or very significant.
(TL) - Type Locality for a valid mineral species.
(FRL) - First Recorded Locality for everything else (eg varieties).
All localities listed without proper references should be considered as questionable.
Australia | |
| Parbhakar-Fox et al. (2019) |
Canada | |
| Nikischer et al. (2012) |
France | |
| Vanaecker et al. (2014) |
| Vanaecker et al. (2014) |
Italy | |
| Costagliola et al. (2008) |
| Costagliola et al. (2008) | |
Nicaragua | |
| Hynek et al. (2013) |
USA | |
| Tice et al. (2001) |
| Kaplan (2016) |
| Dunn (1995) |
| Essene et al. (1987) +1 other reference |
Quick NavTopAbout PetedunniteUnique IdentifiersIMA Classification Classification Mineral SymbolsPhysical Properties Optical Data Chemistry Crystallography Crystal StructureX-Ray Powder DiffractionGeological EnvironmentType Occurrence SynonymsOther LanguagesRelationshipsCommon AssociatesStrunz-MindatOther InformationInternet Links References Localities Locality List
Nain Complex, Labrador, Newfoundland and Labrador, Canada